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I bought a used card and while there are a bunch of added features, the only one I cared about (and use) is the navigation routing. It factors in dept and will auto route you to your destination safely, rather than having to plot your own course around rocks, islands, etc. Great at night or on a foggy day.
The 3d bottom is a cool show off feature that people may think is cool, but it isn't the actual bottom, so not 100% realistic, and nothing you can't see on a normal chart.
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